Option variable
logexpandDefault value: true
Causes log(a^b) to become b*log(a). If
it is set to all, log(a*b) will also simplify to log(a)+log(b). If it
is set to super, then log(a/b) will also simplify to log(a)-log(b) for
rational numbers a/b, a#1. (log(1/b), for integer b, always
simplifies.) If it is set to false, all of these simplifications will
be turned off.